There are three kinds of Russian hardware without US equivalent:
1) Self-propelled AA guns like the ZSU-23–4 or Tunguska.
The closest US equivalent is the Avenger system mounted on Humvee chassis. It has multiple Stinger missiles but pretty deficient in the gun department with just 0.50 caliber MG (as opposed to autocannons used on the Russian systems or the German Gepard). It also doesn’t have radar to scan or track its targets.
Prior to this, there was the M163 VADS, basically an M61 rotary cannon (used on fighters) mounted on an M113 chassis, making it pretty close to the ZSU. There was also the Sergeant York project which was terminated due to cost overrun and questionable utility.
NATO relied on fighters to win air superiority instead of using anti-air defenses. This was fine until the past 10 or so years where we see many types of small drones that might be difficult or impossible for a fighter jet to destroy. Systems like the Gepard is enjoying a renaissance.
2) Dedicated interceptors like the MiG-31.
To be fair, this only makes sense in Russia and maybe Canada. Interceptors had been rendered obsolete by “4th generation” fighters like the F-15 which can carry a large amount of missiles while also being highly maneuverable and pretty fast. Russia (and Canada) are sparsely populated, so an interceptor like the MiG-31 could be used instead of stationing surface-to-air missile launchers to extremely remote locations. Basically, they become mobile SAM batteries.
USAF and USN interceptions are carried out by regular fighters.
3) Battlecruisers/heavy cruiser like the Peter the Great class.
Since the age of anti-ship (nuclear) missiles, the trend for warships other than carriers and submarines is to be as small as possible because large ships are poor value-for-money. The role distinction between classes like cruisers, frigates, and destroyers went away; now it’s only a matter of size.
The Russian battlecruiser/heavy cruiser is just an oddity and honestly makes very little sense considering one or two smaller ships can do the same job. Battlecruisers were pre-WW2 concepts of a heavy cruisers that could outgun and out-armor existing cruisers while being faster than “proper” battleships. The actual utility was questionable in the age of airplanes, so nobody bothered with it after the war other than the Soviets.
